[Note: I’ve edited this post to reflect updated information]
I have a number of Leviton devices (models VRE06-1LZ, VRS15-1LZ, VRF01-1LZ) which support instant status, but I was having a problem that the SmartThings hub didn’t seem to support instant status on these devices. The SmartThings hub was not picking up status changes when the switches were physically pressed. The SmartThings app was also freezing when it attempted to turn off devices that were already off, but it incorrectly thought were on since they’d been pressed at the switch.
I contacted SmartThings Support, and turns out that the SmartThings hub does support instant status with these Leviton devices, but my hub needed a firmware update. After updating the hub’s firmware, excluding all the Leviton devices from the network, and re-adding them, instant status now works properly.